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98 es300 temperature gauge goes down while driving on highway and goes up on local

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  • Lexus Master
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Sounds like thermostat stuck open or missing. Recommend replace and recheck.

Posted on Dec 30, 2013

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Overheating and heater not work

there is a valve on the water pump and one on the thermostat housing open those up one at a time until you get a little bit of antifreeze come out then tighten them back up. All you will be doing is bleeding the air out of the cooling system. my car was doing the same thing after I changed my thermostat.

Posted on Dec 12, 2008

  • 120 Answers

SOURCE: Honda 98 CRV temperature gauge goes way up after an hour on hwy

You will need to change your thermostat as it is stuck and is not responding correctly to temperature changes. Have your mechanic change the thermo, do a flush of the system and all should be good again.

Posted on Oct 06, 2009

mindreader
  • 578 Answers

SOURCE: temperature gauge goes up and down while driving

Temperature sensor is in intake manifold.
Water is not flowing smoothly through the manifold.
2 immediate things to try........
1. Replace the thermostate (about 6 dollars). If you drive the car to an Autozone for the thermostate purchase, they will show you where it is located and how to replace it.

2. Flush (thoroughly) the cooling system. No shortcuts here, buy the flush and follow directions. Have the heater turned on HI.

After the flush, fill with 50-50 antifreeze-water.

Problem within engine are done. Other issue MAY be the sending unit (as your Autozone guy about that... it looks like a spark plug and takes about 3 minutes to replace.

Posted on Nov 28, 2009

chris bean
  • 61 Answers

SOURCE: my temperature gauge keeps going up and down when

pull off the hose at the top of the motor, if you can see the thermostat try pushing on the center with a screwdriver, it is most likely stuck open. You may be able to free it by pushing the center back and forth till there is no longer any resitance, but it needs to be replaced. As for the temp sensor, if it is bad the guage will flicker, representing a bad connection. If the gauge just rises and falls by pattern the sensor and wiring is probably fine.

Posted on Mar 28, 2010

  • 1 Answer

SOURCE: engine coolant temperature gauge alarming. this

lol..buy a new car! are you dting someone?

Posted on Oct 19, 2010

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2000 dodge stratus. Heater only works at idle, when driving at high speeds, heater blows cold and thermostat gauge goes to cold. Back flushed heater core, new thermostat any ideas?


I'd say you have a faulty thermostat, be it new or not. If your temperature gauge goes to cold as your engine is taking you down the highway, the thermostat is not doing its job. The temperature should never come down to below normal until engine is shut off...

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check the circuit to the tem p sender unit by removing the wire at the sender and turning on the ignition touch the wire to the head . The gauge should got o hot. This indicates that the wire is ok . Remove and replace the sender unit as it is shorting out inside and is not showing a resistance. The higher resistance __cold water --the lower the gauge reading. The lower resistance the more current allowed through so the gauge goes up

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After highway driving for 2 hours and stopping for gas the car would initially start and then stall, it would run again until the car cooled for 30 minutes.


Sounds like your coolant level might be low. At highway speed you probably have enough coolant and with the air passing thru the radiator keeps the temp down, but at idle not so much. Or depending whether you have a belt drive or electric fan. Belt driven, could need a new belt.

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Air can be purged. While your engine is cool remove radiator and reservoir caps. Place funnel in radiator. Turn heat to the highest position and start vehicle. Add coolant to radiator as needed while vehicle warms up. You should see bubbles coming out of radiator. Fill reservoir to between cold and hot fill lines. Replace caps when bubbling stops but before coolant temperature reaches normal operating temperature. Never remove the radiator cap until engine has fully cooled down.

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98 F250 heat gauge in red, engine slows down, coolant level steady, rad cool. Had new head gaskets and head planed last Sept. new fan & water pump. What can be wrong?


I am a little confused here, you say the temperature gage is in the red but the engine is only at 140-160? Is that Fahrenheit?

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I also have the same problem, I would also be happy with a diagram of the location of the sensor.

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Honda 98 CRV temperature gauge goes way up after an hour on hwy


You will need to change your thermostat as it is stuck and is not responding correctly to temperature changes. Have your mechanic change the thermo, do a flush of the system and all should be good again.

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Vitara overheat


When driving down highway only, it overheats? When running steady, I take it you mean, sitting idling? If it's only overheating at highway speeds, and all else has been checked out & is o.k., I'd take a close look at rad hoses for soft spots (easy to squeeze) that may be causing hoses to collapse at highway speeds & restricting flow of cooling system. Another thing to try is, turn your heater on high fan & high temperature when it starts to heat up & see if temperature gauge goes down (cooler) at all. If it does, then rad not doing it's job properly.

Jul 12, 2009 | 1999 Suzuki Vitara

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